18c2ecf20Sopenharmony_ci/* SPDX-License-Identifier: GPL-2.0-only */ 28c2ecf20Sopenharmony_ci/* 38c2ecf20Sopenharmony_ci * Based on arch/arm/lib/memchr.S 48c2ecf20Sopenharmony_ci * 58c2ecf20Sopenharmony_ci * Copyright (C) 1995-2000 Russell King 68c2ecf20Sopenharmony_ci * Copyright (C) 2013 ARM Ltd. 78c2ecf20Sopenharmony_ci */ 88c2ecf20Sopenharmony_ci 98c2ecf20Sopenharmony_ci#include <linux/linkage.h> 108c2ecf20Sopenharmony_ci#include <asm/assembler.h> 118c2ecf20Sopenharmony_ci 128c2ecf20Sopenharmony_ci/* 138c2ecf20Sopenharmony_ci * Find a character in an area of memory. 148c2ecf20Sopenharmony_ci * 158c2ecf20Sopenharmony_ci * Parameters: 168c2ecf20Sopenharmony_ci * x0 - buf 178c2ecf20Sopenharmony_ci * x1 - c 188c2ecf20Sopenharmony_ci * x2 - n 198c2ecf20Sopenharmony_ci * Returns: 208c2ecf20Sopenharmony_ci * x0 - address of first occurrence of 'c' or 0 218c2ecf20Sopenharmony_ci */ 228c2ecf20Sopenharmony_ciSYM_FUNC_START_WEAK_PI(memchr) 238c2ecf20Sopenharmony_ci and w1, w1, #0xff 248c2ecf20Sopenharmony_ci1: subs x2, x2, #1 258c2ecf20Sopenharmony_ci b.mi 2f 268c2ecf20Sopenharmony_ci ldrb w3, [x0], #1 278c2ecf20Sopenharmony_ci cmp w3, w1 288c2ecf20Sopenharmony_ci b.ne 1b 298c2ecf20Sopenharmony_ci sub x0, x0, #1 308c2ecf20Sopenharmony_ci ret 318c2ecf20Sopenharmony_ci2: mov x0, #0 328c2ecf20Sopenharmony_ci ret 338c2ecf20Sopenharmony_ciSYM_FUNC_END_PI(memchr) 348c2ecf20Sopenharmony_ciEXPORT_SYMBOL_NOKASAN(memchr) 35